I doubt OP asked for documents from her grandmother.
"I have cancer and can't pay for the treatments :,("
"Ok, I'll help you... After I see documented proof of your devastating ailment."
I doubt OP even considered involving the hospital, because, well, it's grandma.

In my opinion I believe that SOME (not all) Doctors just don't care and just want money. That's why they put you on pills instead of curing, because they get money. They send you to specialists for more money...

I'd prefer not to be taken advantage of, even if it's family. Yes, I'd help a family member in need, ONLY when they actually need it and I know that they'd do the same for me if I ever needed it. Who knows, that might've been OP's life savings.

#9 French speaker made a mistake ;)
#69 Reading OP's FML, she thought that her Grandma was sick, she learned the truth long after.
In the same case I'll spent all my savings too according to my HEART (and I'll surely be angry after knowing the truth).
Doing nothing is just like being a selfish b*tch. That's why I said at least she's a good granddaughter <3

I saw a news story about a teacher who faked having cancer for the money people gave her to help pay the bills. There was another news story on a someone who said their little child had cancer and made a Facebook page that everyone passed around the link for on Facebook so they would get tons of donations. So disgusting!

This is by far the shittiest thing I have ever heard of a grandparent doing to their grandchild.
Hopefully your reaction when she admitted she had been lying to you will cause her to start trying to possibly reimburse you for your grandiose efforts. So sorry this happened to you!